CVE-2026-100888: A weakness has been identified in Trusted Domain Project OpenDKIM up to 2.11.0

Routine

HIGH 7.3REMOTE

CVE-2026-100888 is a high-severity flaw (CVSS 7.3) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A weakness has been identified in Trusted Domain Project OpenDKIM up to 2.11.0. This affects the function dkim_canon_selecthdrs of the file libopendkim/dkim-canon.c of the component DKIM Signature Header Selection. Executing a manipulation of the argument h can lead to out-of-bounds write. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-119, CWE-787
Published	2026-09-28
Last modified	2026-09-30

Publisher (CNA): VulDB

Last updated 2026-09-30 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-09-28 00:16 UTCPublished CVE record published
2026-09-30 23:16 UTCUpdated Record last modified

Advisories and coverage

Official advisories

Amazon Linux 2023 ALAS: ALAS2023-2026-3213 (important): opendkim 2026-10-12

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-100888?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-100888 being exploited?

CVE-2026-100888 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-100888 affect?

CVE-2026-100888 affects affected software. Severity is high (CVSS 7.3). A weakness has been identified in Trusted Domain Project OpenDKIM up to 2.11.0. This affects the function dkim_canon_selecthdrs of the file libopendkim/dkim-canon.c of the component DKIM Signature Header Selection. Executing a manipulation

How urgent is CVE-2026-100888?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Software pages

Canon printers vulnerabilities

References

← Back to latest CVEs